You might also see if any of your local auto part stores rent vacuum pumps.
I saw that at least one local chain does.

As to where to get R-12 gauges, I got mine off of Craigslist for $20.
I couldn't complain about it too much. No idea what brand, but they seem to be a solidly built set, marked as Made in USA as the only script other than the range markings.

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-Josh
Testing the cheap Mercedes axiom, one bolt at a time...